Dave Grohl wore a White Knot, in support of gay marriage, at the MusiCares Person of the Year gala concert.

The Foo Fighters frontman is among the first of many in Hollywood to wear a white ribbon Michael Buble, Adele, Dave Stewart, Kristian Bush and others are supporting the cause, and you can guarantee that's just the start.

'You know what thats about It's I believe in love and I believe in equality and I believe in marriage equality,' Dave Grohl explained.

White Knot supporter Dave Grohl will be a main attraction at The Grammys, performing the Beatles' I Saw You Standing There with Paul McCartney.